/Engine/Plugins/Runtime/RigVM/Source/RigVM/Public/RigVMCore/RigVM.h
Returns the external variables of the VM (without variable memory, as it is stored in Context)
const [TArray](API\Runtime\Core\Containers\TArray)< [FRigVMExternalVariableDef](API\Plugins\RigVM\RigVMCore\FRigVMExternalVariableDef) > & GetExternalVariableDefs() const